Seriously I am so sad. I thought upgrading to 4.4.2 would fix many things for my s4 but it just got worse. I admit that the system is much more smoother now but it's far away from faster. My phone won't unlock/wake up now.. I can swipe on the black screen and it would make the unlock sound but the screen would still not respond/stay black and there is nothing to do unless I pull out the battery. my keyboard is jamming; it happens often that I can't type anything, can't press anything and again, theres nothing to do unless I pull out the battery. I never experienced any of this before the update and it's making me upset because I feel like it's really damaging my only 5 months old s4. I never had to restart my device before and now I have to restart it at least twice a day.. Anyways, I absolutely do not recommend this update.. but for those who their phone seems to be fine, well. you are lucky.

Edit: I'm not the only one!!
http://forums.androidcentral.com/showthread.php?t=364941
http://forums.androidcentral.com/showthread.php?t=374704
http://forums.androidcentral.com/showthread.php?t=390295
Videotron / S4 / SGH-M919V
Posted via Android Central App
EDIT:
After 2 months, I finally might figured out what went wrong with the lockscreen, the warm up problem and the fast battery drain!
1. Google map, GPS or any application that reads your location are what might causing the fast battery drain and the warming up issue.
What I suggest you to do is : go to
settings > more tab > application manager > look for Google Map > clear cache and clear data. Do this everytime after you're done using Google Map only!
If you don't need your GPS, keep it off and try to not allow applications to read your location as it keeps making your device running all the time...
2. Device cleaner, battery saver and antivirus apps are what making the screen stays black (won't wake up) and overheating too.
I don't know why but just uninstall it.. Jelly Bean used to support them but I do not know why it's acting up with Kit Kat..
It's been 1 month now and I got no more problems! Much better battery life (only lose around 1-3% per hour now when idle) , no more excessive warming up and no more blackout! Happy me!!
you don't need to reset your phone. Just make sure to not allow applications to use your localisation and unistall all cleaners apps or antivirus! Then restart it for a last time and it should be fine.
Posted via Android Central App

Edit: I'm not the only one!!
http://forums.androidcentral.com/showthread.php?t=364941
http://forums.androidcentral.com/showthread.php?t=374704
http://forums.androidcentral.com/showthread.php?t=390295
Videotron / S4 / SGH-M919V
Posted via Android Central App
EDIT:
After 2 months, I finally might figured out what went wrong with the lockscreen, the warm up problem and the fast battery drain!
1. Google map, GPS or any application that reads your location are what might causing the fast battery drain and the warming up issue.
What I suggest you to do is : go to
settings > more tab > application manager > look for Google Map > clear cache and clear data. Do this everytime after you're done using Google Map only!
If you don't need your GPS, keep it off and try to not allow applications to read your location as it keeps making your device running all the time...
2. Device cleaner, battery saver and antivirus apps are what making the screen stays black (won't wake up) and overheating too.
I don't know why but just uninstall it.. Jelly Bean used to support them but I do not know why it's acting up with Kit Kat..
It's been 1 month now and I got no more problems! Much better battery life (only lose around 1-3% per hour now when idle) , no more excessive warming up and no more blackout! Happy me!!

you don't need to reset your phone. Just make sure to not allow applications to use your localisation and unistall all cleaners apps or antivirus! Then restart it for a last time and it should be fine.
Posted via Android Central App
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